Remote Spectrum Monitor MS27201A User Guide : Software Option Upgrades : Importing Software License
 
Importing Software License
Importing a new license file:
1. Insert a USB memory device into the PC connected to the instrument.
2. After receiving a new license file from Anritsu, copy the file to the USB memory device in the top (root) level, not in any directory.
3. Open the System menu from the upper left 3-line icon.
4. Navigate to SETTINGS > OPTIONS menu.
5. Select ENABLE OPTIONS USING FILE at the lower right of INSTALLED OPTIONS.

The instrument will search for a valid license file on the USB memory device and apply the changes to the system.
6. Alternatively, to install any additionally purchased software options select INSTALL OPTIONS FROM WEB, only when the instrument is connected to the Internet.
7. Reboot the instrument to ensure if all the changes are applied.
 
Note 
Go to www.anritsu.com to check for firmware and/or software updates for your instruments. Updating your instrument with the newest available version will install all the upgrades.